- Oxygen, Lambda Sensor
- Exhaust Oxygen Sensor (O2 Sensor)
- Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture
- PEUGEOT - 405, 306, 406, 106, 605; CITROËN - ZX, Xsara; FIAT - Punto, Panda; FORD - Escort; BMW - 7, 5; LANCIA - Y, Delta